Device for sharpening the blades of slicing machines for slicing eatables



March 24, 1953 A. DITTING 2,632,289

mzvxcs FOR SHARPENING THE BLADES 0F sucmc M,

MACHINES FOR sucmc EATABLES Filed May 25, 1949 Patented Mar. 24, 1953UNITED STATES PATENT OFFICE DEVICE FOR SHARPENING THE BLADES OF SLICINGMACHINES FOR SLICING EAT- ABLES Adolf Ditting, Zurich, Switzerland 3Claims.

The present invention relates to a device for sharpening the blades ofslicing machines for slicing eatables.

The device is constituted by two grinding wheels set at an angle equalto the taper of the blade on a bracket provided with a means forfastening it on the carriage of the Slicing machine so that to sharpenthe blade the grinding wheels can be fed to the blade together with thecarriage, the grinding wheel designed to remove the burr being held by aspring at a certain axial distance from the said blade so that it isonly when its axle is pressed with a finger that the said grinding wheelcontacts the blade in order to remove the burr produced by the grindingwheel proper.

In the accompanying drawing two embodiments of the object of theinvention are illustrated by way of example.

Fi 1 is a front view of the bracket with the grinding wheels,

Fig. 2 is a top view of Fig. 1,

Fig. 3 shows how the bracket illustrated in Fig. 1 is fastened on aV-shaped carriage,

Fig. 4 shows how the bracket illustrated in Fig. 1 is provided with afiat base and is fastened on a fiat carriage.

The bracket l (of. Fig. 1) has a foot 2 whose bearing surfaces 3 areinclined towards each other and correspond to the recess 4 of the V-shaped carriage 5. This V-shaped foot 2 can be slipped into the recess 4of the carriage 5 and fastened thereon with the screw 6. The said footcan also be designed with a fiat base and can, as shown in Fig. 4, befastened on a fiat carriage, for instance with thumb screws. To the foot2 is attached an arm I provided with two holes which support the axles 8and 9 of the grinding wheels l0 and H. The angle formed by the two axlesis equal to the taper of the blade l2. The wheel l0 carried by the axle9 is pressed by the spring l3 against the collar Hi on the said axle 9.The wheel ll carried by the axle 8 is similarly pressed by the spring 15against the collar [6 on the said axle 8. The distance between thegrinding surface of the wheel H and the smooth side I! of the blade I2is chosen so that the grinding wheel H does not contact the blade l2.The blade I2 is ground by the wheel [0, and the wheel H only serves toremove the burr produced by the wheel l8. For this purpose, on the axle8 there is a rotatable sleeve l8 supported on a ball l9 and held fast inthe other axial direction by a retaining ring 20. A light pressure of afinger on the sleeve l8 sufiices to press the grinding wheel I I againstthe smooth side I! of the blade I2, thus removing the burr.

In practice, if the rotary blade of the slicing machine needs to besharpened, the following procedure is followed. Slicing machines, suchas have been described, ordinarily include a movable plate substantiallyparallel to the plane of the blade for determining the thickness of aslice, and this plate is first moved away from the blade as far as ispossible to free the edge of the blade for sharpening. The foot 2 of thegrinding apparatus is then aflixed to the movable carriage of themachine, as has been described, and this carriage is then moved towardthe blade, which is rotating for the grinding operation. During thisphase of the operation grinding wheel I I does not contact the blade andis maintained at a fixed distance from blade I! by spring 15. Grindingwheel It] does come into contact with the blade edge however and, as thecarriage is moved toward the blade even further, the force of the bladeagainst wheel l0 causes the said wheel Hi to move axially outwardagainst the force of spring [3. Thus it will be noted that the positionof wheel I l with respect to the blade is independent of carriageposition, while the,

physical position of wheel I!) with respect to the blade varies inaccordance with the relative position of blade and carriage. Inasmuch ascarriage movement causes wheel 10 to move in this way when the wheel isin contact with the blade, an automatic pressure control is effectedduring the grinding operation.

The burr which is formed by the abrasive action of wheel [0 on therotary blade is removed by manually pressing wheel ll, against theaction of spring I5, into contact with the blade edge.

I claim:

1. A device for sharpening the blades of slicing machines having acarriage for carrying the article to be sliced and a rotatable blade forslicing said article, comprising a single supporting arm having anintegral pedestal removably mounted upon said carriage, said supportingarm defining first and second bores the axes of which form an angleequal to the taper angle of the edge of said blade, first and secondaxles passing respectively through said bores and axially movabletherein, a first abrasive disc carried by said first axle adjacent oneface of said blade edge, said first axle including first spring biassingmeans urging said first disc into contact with said one face, and asecond abrasive disc carried by said second axle adjacent the other faceof said blade edge, said second axle including second spring biassingmeans normally maintaining said second disc away from said other face,said second axle also including a sleeve attached thereto whereby saidsecond axle may be moved in said second bore against the action of saidsecond spring biassing means to place said second abrasive disc incontact with said other face of said blade edge at the will of theoperator, said rotatable blade being mounted substantiallyperpendicularly to the direction of travel of said carriage, said firstaxle being movable in said first bore against the action of said firstspring biassing means as said carriage is moved toward said rotatableblade whereby said first abrasive disc is maintained in contact withsaid one face of said bladev and the physical position of said firstabrasive disc with respect to said supporting arm varies with theposition of said moving carriage, the position of said second abrasivedisc with respect to said supporting arm being independent'of theposition carriage, one of said first and second bores being adjacent theother extremity of said supporting arm, and the other of said first andsecond bores being intermediate the extremities of said supporting arm.

3. The device of claim 2 wherein said first and second axles includecollars: between said abrasive discs and said supporting arm todeterminelimit positions of said abrasive discs.

ADOLF DITTING.

REFERENCES CITED The following references are of record in the file of,this patent:

UNITED STATES PATENTS Number Name Date 1,033,795 Goodfellow July 30,1912 1,176,136 Demuth Mar. 21, 1916 1,308,786 Hopkinson July 8, 19191,483,878 Hand Feb. 19,. 1,924 ,7 2 04.. mpb ll Ami-.12, 1,930;2,022,799 Blosser et a1. Dec. 3, 1,935 2,291,260 Streckfuss et a1. July26, 1942 FOREIGN PATENTS Number Country Date 116,073 Sweden Nov. 17,194.4,

